I gave in today and tried some Allegra. Within 20 minutes I have almost stopped coughing. I do feel drowsy but I was drowsy before from coughing all night! I read that even though antihistamines all "do the same thing", we don't all react to them the same. We have to do trial and error to find the ones that work. I'll trade you my two boxes of Claritin and Claritin D for some Allegra ;)

